Filter with housing

ABSTRACT

A filter with housing including a filter element (12) shaped as a round cartridge, a housing (10) and a housing lid (11). The housing has a raw air inlet (19) and a clean air outlet (20). The clean air outlet is provided with a connecting support (16) on which the filter element (12) is arranged. The filter element has a radial gasket on its side that faces the connecting support and is guided by the housing at its side opposite from the connecting support.

BACKGROUND OF THE INVENTION

The invention relates to a filter with housing comprising a filterelement in the form of a round cartridge, a housing with a raw air inletand a clean air outlet, and a housing lid, in which the clean air outletis provided with a connecting piece on which the filter element isarranged.

EP 317 417 A2 discloses a filter with housing in which a filtercartridge is clamped in a housing and can be fixed by means of a cam anda spring element. In order to fix the filter cartridge reliably in thehousing, high restraining forces are necessary. These are produced bymeans of appropriate mounting elements.

The filter cartridge is sealed off axially. This means that a certaincompensation for tolerance is necessary since a filter cartridgeexhibits particular length tolerances. Likewise, additional mechanicalelements are necessary for this tolerance compensation.

SUMMARY OF THE INVENTION

The object of the invention is to provide a filter with housing whichcan be manufactured with a low expenditure in construction components;which does not require any elements compensating for tolerance, andwhich avoids the disadvantages noted above.

This object is achieved by the invention as described hereinafter.

The significant advantage of the invention lies in that the constructionin accordance with the invention leads to reliable support of the filterelement, both in the area of the connecting piece as well as on theopposite side. Several possibilities exist for fastening the filterelement on the opposite side. For one, it is possible to support thefilter in the peripheral area at the housing wall. Another possibility,as described in another embodiment of the invention, is to provide anaxial stop for the filter element, which directly or indirectly fixesthe axial position of the filter element. This axial stop can beconstructed as a manually actuatable sliding element, or a hinge or aflap, by means of which the support on the housing ensues. In a slidingclement, the guidance of the filter element occurs by means ofappropriate guiding surfaces or, in accordance with further development,through an axial opening of the filter element into which a guidingsupport of the sliding element engages. So that the position of thesliding element is defined within a certain area, the sliding elementcan be fitted with a detent projection which forms a stop on the housingin accordance with another embodiment of the invention.

It is necessary to assure that operation of the internal combustionengine without the filter is prevented, especially when the filter isused for the intake air of an internal combustion engine. This can beachieved in accordance with one embodiment of the invention, in that ablocking element is provided on the sliding element which preventsclosure of the housing lid if no filter element or an improperlyinstalled filter element is present. Only when the filter element isproperly installed, can the lid be closed correctly, such that with aclosed lid it is assured that a filter element is installed properly andthus the intake air will be guided through the filter element.

In accordance with further embodiment, it is proposed to provide thefilter element with a support body and to effect the seal on the cleanair side by means of the support body. The support body has theadvantage that especially high differential pressures can be absorbedeffectively. This support body can, for example, have a gasket in theform of an O-ring gasket, which effects the sealing between the raw airchamber and the clean air chamber.

These and further characteristics of preferred embodiments of theinvention are found not only in the claims, but also appear from thespecification and the drawings, whereby the individual features can eachbe realized individually or together in various subcombinations inembodiments of the invention and in other fields, and may representadvantageous embodiments which are themselves worthy of protection andfor which protection is claimed here:

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is explained below in further detail with reference toillustrative embodiments.

FIG. 1 shows a sectional view of a filter with housing with an openedlid,

FIG. 2 shows the filter with housing shown in FIG. 1 with a closed lid,

FIGS. 3a through c show various views of a filter system with a supporttube.

DESCRIPTION OF PREFERRED EMBODIMENTS

The filter shown in FIG. 1 comprises a housing 10, a housing lid 11, anda filter element 12 which is arranged in the housing. The filter clement12 is a paper filter 13 with zig-zag-shaped folds in a starconfiguration. The paper filter 13 has end discs 14, 15 on its endfaces. The end disc 15 is slid over a connecting piece 16 of the housing10 and produces a radial sealing between the raw air chamber 17 and theclean air chamber 18. The raw air flows into the raw air chamber 18through the raw air inlet 19. While the entrained particles arc filteredout by the filter element 12, the filtered air leaves the filter systemthrough the clean air chamber 18 and the connecting piece 16, as well asthe clean air tube 20. The housing is equipped with a sliding element 21for stabilizing the filter element 12. The sliding element 21 is locatedin the position shown here to install or remove the filter element 12.The sliding element has a blocking element 22 which in the positionshown prevents closure of the lid 11 which is provided with a projection23. This means that with an opened sliding element 21, it is notpossible to use the housing filter. Instead, this position is onlysuitable for exchanging the filter element 12. The sliding element 11also includes a stop projection 39 for defining a range of displacementof the sliding element 21 relative to the housing. The housing lid 11also has a securing element 24. This consists of a rod 25 and anelastomer cap 26 fastened thereon.

The manner of operation of the securing element 24 is explained in moredetail with reference to FIG. 2. Corresponding parts are identified bythe same reference numbers.

The operational position is attained as soon as the sliding element 21is moved to the filter element 12. This operational position can be seenin FIG. 2. The right side sealing of the filter element between the rawair chamber and the clean air chamber also ensues here by means of asupport guide 37 which produces a radial seal in conjunction with theend disc 14. In the position of the sliding element 21 shown here, thesecuring element 24 can engage inside the blocking element 22 andprevents opening of the sliding element 21. At the same time, an orderlyclosing of the housing lid 11 is now possible. The housing lid 11 issecured to the housing with tensioning clamps or snap closures.

The elastomer cap 26 on the rod 25 creates a weak connection between thelid and the sliding element 21 and prevents a transfer of vibrations orshaking. In addition, the weak connection has a tolerance-compensatingeffect.

The different views a-c of FIG. 3 show a filter system with a supporttube. A filter housing 27 is provided with a housing lid 28. The filterelement 30 is located on a support tube 29 in the filter housing. Thesupport tube is connected to the clean air connecting piece 32 via asealing element 31. The filter element can be centered or prepositionedadjacent the ribs 33, 34 of the filter housing. To install the filterelement 30, this can be moved by means of a suitable medium, for examplewith a lever 35, into the axial target position shown here. Fordisassembly, the filter element is pulled from this target position andremoved in an upward direction.

The housing lid is fitted with a safety device 36. This safety devicecomprises a projection extending into the interior of the housing. Tothe extent that the filter element 30 is not in the target position,this projection prevents the closing of the housing lid.

As shown in FIG. 3b, the filter element is arranged asymmetrically inthe housing. The lid 28 is provided with a central closure 36 accordingto FIG. 3c. This central closure is for example a bayonet plug andenables a particularly rapid and trouble-free opening and closing of thehousing lid 28.

What is claimed is:
 1. A filter with housing, comprising a filterelement in the form of a cylindrical cartridge, a housing and a housinglid, wherein the housing has a raw air inlet and a clean air outlet, andthe clean air outlet is provided with a connecting support on which thefilter element is arranged, the filter element has a radial gasket onthe side facing the connecting support, and the filter element on theside opposite from the connecting support is guided by a sliding elementprovided on the housing, said housing lid including a securing elementand said sliding element including a locking element, wherein thesecuring element engages the locking element when the housing lid isclosed thereby preventing movement of the slide element.
 2. A filterwith housing according to claim 1, wherein said securing element fixesthe axial position of the filter element.
 3. A filter with housingaccording to claim 1, wherein the sliding element carries a supportguide which engages in an axial opening of the filter element.
 4. Afilter with housing, comprising a filter element in the form of acylindrical cartridge, a housing and a housing lid, wherein the housinghas a raw air inlet and a clean air outlet, and the clean air outlet isprovided with a connecting support on which the filter element isarranged, the filter element has a radial casket on the side facing theconnecting support, and the filter element on the side opposite from theconnecting support is guided by a sliding element provided on thehousing, wherein the sliding element is provided with at least one stopprojection which defines a range of displacement of the sliding elementrelative to the housing.
 5. A filter with housing, comprising a filterelement in the form of a cylindrical cartridge, a housing and a housinglid, wherein the housing has a raw air inlet and a clean air outlet, andthe clean air outlet is provided with a connecting support on which thefilter element is arranged, the filter element has a radial gasket onthe side facing the connecting support, and the filter element on theside opposite from the connecting support is guided by a sliding elementprovided on the housing, wherein a blocking element, which preventsclosure of the housing lid whenever the filter element is not properlyinstalled, is provided on the sliding element.
 6. A filter with housingaccording to claim 1, wherein the filter element is provided with asupport body, and the support body cooperates with a connecting piece toseal a clean air chamber of the filter.
 7. A filter with housingaccording to claim 6, wherein a sealing gasket is provided between thesupport body and the connecting piece.
 8. A filter with housingaccording to claim 7, wherein said sealing gasket is an O-ring gasket.